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Outlet nozzle and a method for manufacturing an outlet nozzleRelated Patent Categories: Power Plants, Reaction Motor (e.g., Motive Fluid Generator And Reaction Nozzle, Etc.), Including Heat Exchange Means, For A LiquidOutlet nozzle and a method for manufacturing an outlet nozzle description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070144142, Outlet nozzle and a method for manufacturing an outlet nozzle. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation patent application of International Application No. PCT/SE02/00020 filed 9 Jan. 2002 which was published in English pursuant to Article 21(2) of the Patent Cooperation Treaty, and which claims priority to Swedish Application No. 0100076-9 filed 11 Jan. 2001 and to U.S. Provisional Application No. 60/261,045 filed 11 Jan. 2001. Said applications are expressly incorporated herein by reference in their entireties. BACKGROUND OF INVENTION [0002] 1. Technical Field [0003] The present invention relates to the field of outlet nozzles for use in liquid fuel rocket engines. Also, the invention relates to a method for manufacturing these nozzles. The invention is especially intended for use with respect to cooled outlet nozzles for rocket motors driven by liquid fuel. [0004] 2. Background of the Invention [0005] During operation, a rocket nozzle is subjected to very high stresses, for example in the form of a very high temperature on its inside (on the order of magnitude of 980.degree. F.) and a very low temperature on its outside (on the order of magnitude of 370.degree. F.). As a result of this high thermal load, stringent requirements are placed upon the choice of material, design and manufacture of the outlet nozzle. [0006] At a minimum, the need for effective cooling of the outlet nozzle must be considered. [0007] Cooling is provided by attaching individual lengths of tubing on the inside surface of the nozzle. The geometry of each tube is such that it must conform to the conical or parabolic shape of the nozzle. Additionally, the entire inside surface of the nozzle must be covered to prevent "hot spots" which could result in premature failure of the nozzle. Each nozzle typically has a diameter ratio from the aft or large outlet end of the nozzle relative to the forward or small inlet end of the nozzle ranging from 2:1 to 3:1. [0008] According to a previously known method of manufacturing a cooled outlet nozzle, rectangular tubes of constant cross section made from nickel-based steel or stainless steel are utilized and arranged parallel with another, and are welded together. [0009] The tubes are helically wound such that they form an angle of helix in relation to the longitudinal axis of the nozzle, which angle increases progressively from the inlet end of the nozzle to its outlet, thereby forming a bell shaped nozzle wall. Rocket engine exhaust flowing along the inside surface of such a nozzle with helically arranged tubes results in an angled reaction force that endures a roll momentum on the rocket and which must be compensated for by some additional means. These additional means often lead to increased weight and increased flow resistance. Having long channels without any increase in cross section will also affect the coolant flow resistance negatively. SUMMARY OF INVENTION [0010] An object of the present invention is to provide a nozzle and a method for its manufacture that avoids the problems described above. This is achieved by means of a nozzle that comprises (includes, but is not limited to) at least two longitudinally arranged sections with a shift between a positive and a negative channel angle in the transition from one section to an adjacent section. As a result of the invention, it is possible to reduce the roll momentum created by the helical tube channels. [0011] According to an advantageous embodiment of the invention, the different angles of the cooling channels in the nozzle sections are adapted to quench reaction forces originating from exhaust flowing past the channels. In this manner, it is possible to avoid the roll momentum. [0012] According to another embodiment of the invention, each cooling channel extends helically with respect to the longitudinal axis of the nozzle. [0013] According to one embodiment of the invention, the channels in each section have a constant cross section along their length. [0014] Alternatively, the cross sectional area of the channels of two adjacent nozzle sections may be different. In this embodiment, the cross sectional area of the nozzle channels is preferably larger for a downstream nozzle section than for an upstream nozzle section. [0015] A method according to the invention includes joining a plurality of tubular channels to form a first section of the outlet nozzle in which the channels have an angle of helix in relation to the longitudinal axis of the nozzle. A plurality of tubular channels are also joined to form a second section of the outlet nozzle in which the channels have opposite angles of helix in relation to the longitudinal axis of the nozzle. The sections are then joined to form a composite outlet nozzle having continuous cooling channels. BRIEF DESCRIPTION OF DRAWINGS [0016] The invention will be further described in the following, in a non-limiting way with reference to the accompanying drawings in which: [0017] FIG. 1 is a perspective view showing a nozzle configured according to the invention; [0018] FIG. 2 is a longitudinal, cross-sectional view through a joint between two sections, shown in larger scale and before welding; and [0019] FIG. 3 shows the joint according to FIG. 2, but after welding. DETAILED DESCRIPTION Continue reading about Outlet nozzle and a method for manufacturing an outlet nozzle... Full patent description for Outlet nozzle and a method for manufacturing an outlet nozzle Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Outlet nozzle and a method for manufacturing an outlet nozzle patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Outlet nozzle and a method for manufacturing an outlet nozzle or other areas of interest. ### Previous Patent Application: Pulsed combustion fluidic nozzle Next Patent Application: Diagnostic apparatus and diagnostic method for an internal combustion engine Industry Class: Power plants ### FreshPatents.com Support Thank you for viewing the Outlet nozzle and a method for manufacturing an outlet nozzle patent info. 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